CVE-2026-74436
rxrpc: serialize kernel accept preallocation with socket teardown
Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: serialize kernel accept preallocation with socket teardown rxrpc_kernel_charge_accept() reads rx->backlog without any socket/backlog synchronization and passes that raw pointer into rxrpc_service_prealloc_one(). A concurrent rxrpc_discard_prealloc() sets rx->backlog = NULL and frees the backlog rings, so a kernel preallocation worker can keep using a freed struct rxrpc_backlog while updating *_backlog_head/tail and array slots. Serialize the state check and backlog lookup with the socket lock, and reject kernel preallocation once teardown has disabled listening or discarded the service backlog.
INFO
Published Date :
Aug. 15, 2026, 6:22 a.m.
Last Modified :
Aug. 15, 2026, 6:22 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-74436
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Apply kernel updates to serialize accept preallocation.
- Ensure socket lock protects backlog access.
- Reject preallocation during teardown.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74436.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74436 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74436
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74436 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74436 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '00e907127e6f86d0f9b122d9b4347a8aa09a8b61', 'lessThan': '0337cdba0c477f176c0459bed012109453184573', 'versionType': 'git'}, {'status': 'affected', 'version': '00e907127e6f86d0f9b122d9b4347a8aa09a8b61', 'lessThan': 'dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5', 'versionType': 'git'}, {'status': 'affected', 'version': '00e907127e6f86d0f9b122d9b4347a8aa09a8b61', 'lessThan': '35a967ff8b24db09ee429c39c5b5e6571639997d', 'versionType': 'git'}, {'status': 'affected', 'version': '00e907127e6f86d0f9b122d9b4347a8aa09a8b61', 'lessThan': '1741378a7a83dfd8e53a9196730df709b903cd33', 'versionType': 'git'}, {'status': 'affected', 'version': '00e907127e6f86d0f9b122d9b4347a8aa09a8b61', 'lessThan': 'dc175389b18c29a5303ee83169ec653adfae3e17', 'versionType': 'git'}], 'programFiles': ['net/rxrpc/call_accept.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.9'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.9', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/rxrpc/call_accept.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: rxrpc: serialize kernel accept preallocation with socket teardown rxrpc_kernel_charge_accept() reads rx->backlog without any socket/backlog synchronization and passes that raw pointer into rxrpc_service_prealloc_one(). A concurrent rxrpc_discard_prealloc() sets rx->backlog = NULL and frees the backlog rings, so a kernel preallocation worker can keep using a freed struct rxrpc_backlog while updating *_backlog_head/tail and array slots. Serialize the state check and backlog lookup with the socket lock, and reject kernel preallocation once teardown has disabled listening or discarded the service backlog. Added Reference https://git.kernel.org/stable/c/0337cdba0c477f176c0459bed012109453184573 Added Reference https://git.kernel.org/stable/c/1741378a7a83dfd8e53a9196730df709b903cd33 Added Reference https://git.kernel.org/stable/c/35a967ff8b24db09ee429c39c5b5e6571639997d Added Reference https://git.kernel.org/stable/c/dc175389b18c29a5303ee83169ec653adfae3e17 Added Reference https://git.kernel.org/stable/c/dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5